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Quiz about What Do You Know About Statics

What Do You Know About Statics? Quiz

This quiz covers the topic of statics (engineering mechanics), one of the first and most fundamental college courses in an engineering curriculum. You should have some knowledge of this material to do well on this quiz.

A multiple-choice quiz by AlienGoddess. Estimated time: 5 mins.

Author
AlienGoddess

Time
5 mins

Type
Multiple Choice

Quiz #
198,931

Updated
Jan 11 23

# Qns
10

Difficulty
Average

Avg Score
6 / 10

Plays
704

One at a Time - Single Page - Timed Game

Question 1 of 10

1. What is one of the primary assumptions made in the study of statics? Hint

Objects analyzed do deform, and these deformations must be considered

Objects analyzed are rigid bodies, meaning they do not deform

The motion of the object is the most important element analyzed

The thermal effects of the object are the most important elements analyzed

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Question 2 of 10

2. One type of support for a beam is a pin connection. If a pin connection is able to turn and is viewed in two dimensions only, what type of movement can it NOT resist? Hint

Horizontal (force in x-direction)

It can resist all types of movement

Vertical (force in y-direction)

Rotational (moment)

3. A uniform steel beam is supported with a pin at its left end (point A) and a roller at its right end (point B). The beam is 5 meters long and a vertical (downward) point load of 6 kilonewtons (kN) is applied at the center of the beam (2.5 meters away from points A and B). Neglect the weight of the beam. What are the VERTICAL reactions at the supports A and B? Hint

A = 6 kN (up), B = 0 kN

A = 7 kN (down), B = 7 kN (down)

A = 4 kN (up), B = 3 kN (down)

A = 3 kN (up), B = 3 kN (up)

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Question 4 of 10

4. What is the mathematical definition, or magnitude, of a moment about a point? Hint

Force x Distance

Mass x Acceleration

Force x Force

Velocity x Weight

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Question 5 of 10

5. A truss is "a framework composed of members joined at their ends to form a rigid structure" (Meriam and Kraige, 2002). Examples include bridges and roof supports. What are the members in a truss typically assumed to be? Hint

Simple-force members

Three-force members

Two-force members

Plane-force members

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Question 6 of 10

6. A uniform wooden beam is supported with a pin at its left end (point A) and a roller at its right end (point B). The beam is 3 meters long. A rectangular distributed load of 8 kN/m is placed on the beam. This load covers the entire span of the beam and is vertically pointing downward. Neglect the weight of the beam. What is the vertical reaction at the roller support at point B? Hint

24 kN (up)

39 kN (down)

8 kN (down)

12 kN (up)

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Question 7 of 10

7. If the gravitational attraction, or weight, of an object is resolved into a single point load, where does this load typically act on the object? Hint

At an extreme end

Through the moment of inertia

Someplace off of the object

Through the center of mass

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Question 8 of 10

8. A cantilever beam is a beam that is fixed at one end and free at the other. The fixed end can resist both force and moment. If a cantilever beam 2 meters long is loaded with a 10 kN point load applied vertically downward at the free end, what is the resisting moment at the fixed end? Neglect the weight of the beam. Hint

10 kN-m

20 kN-m

150 kN-m

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Question 9 of 10

9. How are the reactions at pin and roller connections determined for a truss? Hint

By using the truss method of reactions

It's impossible; you have to guess

These values are always given

The same way as for a beam

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Question 10 of 10

10. A course that is taken after statics and that is closely related to statics is called dynamics. What is the primary (and most logical) difference between statics and dynamics? Hint

Dynamics doesn't consider the forces action on bodies

Statics and dynamics cover the exact same material; dynamics is just much harder!

Statics doesn't consider friction from contact surfaces

Statics deals with equilibrium of bodies, while dynamics covers motion of bodies

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Quiz Answer Key and Fun Facts

1. What is one of the primary assumptions made in the study of statics?

Answer: Objects analyzed are rigid bodies, meaning they do not deform

When studying statics, it is assumed that the objects being analyzed are rigid bodies. The deformation of the object while under the action of forces is not considered in statics, and is instead studied in a later course that builds on statics, typically called "strength of materials".

2. One type of support for a beam is a pin connection. If a pin connection is able to turn and is viewed in two dimensions only, what type of movement can it NOT resist?

Answer: Rotational (moment)

A pin connection that is free to turn can resist forces in any direction in plane of the pin, but it cannot support a moment, which is why the pin can rotate about its axis.

Answer: A = 3 kN (up), B = 3 kN (up)

You could solve this problem by summing moments at one point, and then sum the forces in the y-direction. But there's a short cut. Since the beam and loading is symmetrical, just take the applied 6 kN force and divide it by 2, and that's the value of each reaction force.

The reactions must point up to counteract the downward applied force. Since the loading is vertical, the horizontal reaction at A is zero.

4. What is the mathematical definition, or magnitude, of a moment about a point?

Answer: Force x Distance

Moment is the rotational tendency of a force about an object, and is typically denoted by the letter M. The magnitude of a moment about a point is found by multiplying the force by the distance of the force application to the point.

Answer: Two-force members

Truss members are two-force members, where two forces are applied at the ends of the member and are equal, opposite, and collinear (Meriam and Kraige, 2002).

Answer: 12 kN (up)

The distributed load is resolved into a point load by finding the area of the load. Since the loading is rectangular, the area is simply the height (8 kN/m) multiplied by the length (3 meters), giving a point load of 24 kN. Since the force acts through the centroid of the loading, for a rectangle this would be the center of the beam, or 1.5 meters away from B.

This problem is symmetrical, so the reaction at B is just half of 24 kN, giving a value of 12 kN. The vertical reaction at A is also 12 kN, and the horizontal reaction at A is zero due to the vertical loading.

7. If the gravitational attraction, or weight, of an object is resolved into a single point load, where does this load typically act on the object?

Answer: Through the center of mass

When resolving the force of gravity of an object into a single point load, this load acts through the object's center of mass and points down toward the earth.

Answer: 20 kN-m

This is a perfect example of the definition of moment where M = force x distance. Since there is only one applied force present, this problem is solved simply by multiplying 10 kN by 2 meters, yielding an answer of 20 kN-m.

9. How are the reactions at pin and roller connections determined for a truss?

Answer: The same way as for a beam

Finding the reactions for a truss is done exactly the same way as for a beam. You simply "collapse" the truss, or look at it the same as a beam, and go from there. There is no such thing as a truss method of reactions!

10. A course that is taken after statics and that is closely related to statics is called dynamics. What is the primary (and most logical) difference between statics and dynamics?

Answer: Statics deals with equilibrium of bodies, while dynamics covers motion of bodies

Statics is the study of the equilibrium of bodies while being acted on by forces, and dynamics concerns the motion of these bodies. Some information for this quiz was taken from my own statics book: "Engineering Mechanics--Statics, 5th Edition" by J.L. Meriam and L.G. Kraige; published by John Wiley & Sons, Inc., in 2002.

Source: Author AlienGoddess

This quiz was reviewed by FunTrivia editor crisw before going online.
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